INDIVIDUAL AND GROUP DEVIATIONS FROM "CHANNELWISE" GRID PROGRESSION IN GIRLS
1952; Wiley; Volume: 23; Issue: 3 Linguagem: Inglês
10.1111/j.1467-8624.1952.tb05731.x
ISSN1467-8624
Autores Tópico(s)Obesity, Physical Activity, Diet
ResumoIn 1941, N. C. Wetzel introduced new method for evaluating physical fitness (I3), a method based upon a grid, which has since come to be known as the Wetzel Grid, or more simply, as the Grid. While the grid method employs only the minimum data of age, height, and weight, it represents a methodological advance over previous systems, in the way these three variables are related. grid plot is logarithmic, weight is plotted against height (rather than separately) to provide a measure of physique, and from the combination of weight and height, surface area and hence basal heat production can at least be estimated. Finally, the grid contains a series of parallel lines, delimiting nine physique channels, for use in following the growth of children of different physical types. These are a basic feature of the grid system. They represent dimensional paths along which children may be expected to proceed under normal (or optimal) conditions. This basic philosophy is carefully outlined in the original publication, and the idea of channelwise progression is illustrated by selected examples. In short, healthy development continues in an established channel, as though this were a preferred path. The channels are straightline paths for the duration of school life, that is from 6 to 18 years and beyond (13, p. ii89). Final settling in a channel may be delayed a year, but only in exceptional cases will this be later than the age of 8 years. may be stated as a simple and practical rule, that normal variations do not exceed one-half channel per Io units of development. These quotations are selected to illustrate the basic doctrine of channelwise progression, the age at which the channel course is expected to become evident, and the tolerance limits (boundaries) that delimit normal growth. Accepting the idea of channelwise progression, spelled out in 1941 and repeated in later publications (i4, 15, I6), the utility of the grid is obvious. It can be used to plot growth deviations, the effects of endocrinopathy or malnutrition, and the success of various therapeutic measures. Again, as-
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